<?php

namespace Think;

class MyPage {

    private $total;      //总记录  
    private $pagesize;    //每页显示多少条  
    private $limit;          //limit  
    private $page;           //当前页码  
    private $pagenum;      //总页码  
    private $url;           //地址  
    private $bothnum;      //两边保持数字分页的量 
    private $mysql;
    private $table;

    //构造方法初始化  
    public function __construct($_total, $_pagesize) {
        $this->total = $_total ? $_total : 1;
        $this->pagesize = $_pagesize;
        $this->pagenum = ceil($this->total / $this->pagesize);
        $this->page = $this->setPage();
        $this->limit = "LIMIT " . ($this->page - 1) * $this->pagesize . ",$this->pagesize";
        $this->url = $this->setUrl();
        $this->bothnum = 2;
    }

    //拦截器  
    public function __get($_key) {
        return $this->$_key;
    }

    //获取当前页码  
    private function setPage() {
        if (!empty($_GET['page'])) {
            if ($_GET['page'] > 0) {
                if ($_GET['page'] > $this->pagenum) {
                    return $this->pagenum;
                } else {
                    return $_GET['page'];
                }
            } else {
                return 1;
            }
        } else {
            return 1;
        }
    }

    //获取地址  
    private function setUrl() {
        $_url = $_SERVER["REQUEST_URI"];
        $_par = parse_url($_url);
        if (isset($_par['query'])) {
            parse_str($_par['query'], $_query);
            unset($_query['page']);
            $_url = $_par['path'] . '?' . http_build_query($_query);
        }
        return $_url . "?";
    }

    private function pageList() {
        $_pagelist = '';
        for ($i = $this->bothnum; $i >= 1; $i--) {
            $_page = $this->page - $i;
            if ($_page < 1)
                continue;
            $_pagelist .= ' <a href="' . $this->url . '&page=' . $_page . '">' . $_page . '</a> ';
        }
        $_pagelist .= ' <span class="me">' . $this->page . '</span> ';
        for ($i = 1; $i <= $this->bothnum; $i++) {
            $_page = $this->page + $i;
            if ($_page > $this->pagenum)
                break;
            $_pagelist .= ' <a href="' . $this->url . '&page=' . $_page . '">' . $_page . '</a> ';
        }
        return $_pagelist;
    }

    public function pageList_ajax() {
        $pagecode = '';
//        if ($this->page == 1) {
//            $num = $this->page + ($this->pagenum - 1);
//        } else if ($this->page == 2) {
//            $num = $this->page + ($this->pagenum - 2);
//        } else {
//            $num = $this->page + ($this->pagenum - 3);
//        }
//        if ($num > $this->pagenum) {
//            $num = $this->pagenum;
//        }
        
        $num = $this->pagenum;
        for ($i = $this->bothnum; $i >= 1; $i--) {
            $_page = $this->page - $i;
            if ($_page < 1) {
                continue;
            } else {
                $arr[] = $_page;
            }
        }
        for ($i = $this->page; $i <= $num; $i++) {
            $arr[] = $i;
        }
        $pagecode = implode(' ', $arr);
        return $pagecode;
    }

    //首页  
    public function first() {
        return 1;
    }

    //上一页  
    public function prev() {
        if ($this->page <= 1) {
            return 1;
        }
        return $this->page - 1;
    }

    //下一页  
    public function next() {
        if ($this->page == $this->pagenum) {
            return $this->pagenum;
        }
        return $this->page + 1;
    }

    //尾页  
    public function last() {
        return $this->pagenum;
    }

}

?>    